Heater



Dec. 17, 1929. 7 MURRAY 1,739,767

HEATER Filed June 17, 1924 2 Shee ts-Sheet. 1

E56 11v VENTOR Eon/15 EMURRAK TTORNEY Dec. 17, 1929. MURRAY 1,739,767

HEATER Filed June 17, 1924 i Sheets-Sheet 2 i 5 E x 56 [NV/JNTORHomsLZMI/RRAK By A TOR/V5) Patented Dec. 17, 1929 UNITED STATES PATENTOFFICE v THOMAS E. MURRAY, 0F BROOKLYN, NEW YORK; JOSEPH BRADLEY MURRAY,THOMAS E. MURRAY, JR., AND JOHN E MURRAY EXECUTORS OF SAID THOMAS E.

MURRAY, DECEASED THEATER Application filed June 17, 1924. SeriaLNo.720,486.

This invention relates toheating apparatus and while not limited theretothe embodiments of the invention illustrated are adapted for use inhousehold or domestic heating systems. The heater may be used inconnection with either steam or hot water systems.

In the drawings, Fig. 1 illustrates one embodiment of the invention;

Fig. 2 and Fig. 3 are respectively a central section and perspectiveView of a sectional unit forming part of the shell of the heater shownin Fig. 1;

Fig. 4 is a perspective view showing the construction of extendedsurface members shown in the foregoing figures;

Fig. 5 is a perspective detail;

Fig. 6 is a view similar to Fig. 1 in which the substantially helicalextended surface members are of slightly different construc tion;

Fig. 7 is a detail section of one of the sectional units of the shell ofthe heater shown in Fig. 6;

Fig. 8 is a perspective view of the extended surface members of Figs. 6and 7.

Referring to the embodiment of the invention illustrated in Figs. 1 to 5inclusive, the heater comprises in general a central vessel 10,combustion chamber section 12 including grate 13, a plurality of shellsections 14 and an outer casing 16. The casing 16 is formed withasuit-able fire door opening 18, and ash pit opening 20 for theintroduction of fuel and the removal of ash, respectively. The vessel 10is suitably supported by means of angle bars or similar bearing members22secured to or forming part of the combustion chamber section 12. Thevessel is supplied with water fed through an inlet pipe 24 and theheated water leaves by a pipe 26 to be circulated through the heatingsystem or to provide hot water for domestic purposes. A suitable watergauge 28 is provided to indicate the level of water in the vessel 10 ifthe heater is used as a steam boiler, this gauge being connected bymeans of pipes 30 and 82 with the pipe 26 and intermediate portion ofthe heater 10. I preferably interpose a layer of heat insulatingmaterial 34 between the shell sections 14 and the outer casing 16 inorder to conserve the heat energy of the apparatus asmuch as possible.

Heaters heretofore constructed have proven to be somewhat inefficient inthat they do not recover for useful purposes anything like the amount ofheat units contained in the fuel which is consumed. In other words, the

conventional heaters heretofore in general use pass a great quantity ofvaluable heat up the stack which is wasteful. My improved heater aims toprovide means whereby an inr creased amount of heat is obtained from theproducts of combustion and thisheat is transferred to the water or othermedium circulated through the system. In order to transfer a maximumnumber of heat units from the fuel burned to the water in the vessel 10,I

provide a novel, arrangement of members which furnish a greatly-extendedsurface. which the products of combustion contact with. These membersare heatedby convection from the combustion products and trans- I mitthe heat by conduction through the walls of the vessel 10 containing theheatmedium.

The combined surface area of the extended. surface members is calculatedto absorb the greater partof the heat units from the combustion gasespassed through the heater. The members which form this extended surfaceas shown in the drawings comprise a multiplicity of flat arcuatesegmental plates 36 which are spaced apart both longitudinally andcircumferentially as best shown in Fig. 4. The several plates 36 areconnected-by means of longitudinally extending plates 38.

shown in Fig. 3 so as to form a unit therewith.

As thus arranged, the complete heater is assembled byplacing a number ofsections one over the other, the adj acent sections being secured to oneanother in any suitable manner for example by means or connecting stripsshown in Fig. 3 which may be riveted, bolted, Welded or otherwisesecuredto the adjoining sections; When the parts area'ssen'ibled thevarious'plates 36"a11'd 38 of the several sections 14 will define a tortuouspassage' way &2 which theiprodu'cts of combustion from the chamber 12must traverse as indicate-d, by the arrows in Fig. l in order to escapethrough the stack outlet 44. To obtain. the mixiinum heat absorption bythe heater, 1 preferably Weld or in some other suitable" manner unitethe extended surface membersBBto vessel 10 in order to' getthe'fnal xinunfi heat conductii' it' from-these i'fienibe'rs' tof said vessel; w, 7

In Figs. 6 to 8, I have "illustrated aslightly' modified form or Heaterwherein the shell" of the heater is made of sections similar to those;above desfcribetl each section conxterra d' surface members 36 3vl i'cl1are connected step plates 38?. Each plate 36 extends ISO-aroundthe'meinber 1O,'he nce,

th'ereare two plates per turn of the helical member here shown; Theother parts of the heater are-substantially the same as those shovvnjinFig. 1 and thecorrespondmg parts aresimilarly numbered; p v i V The?extended surface members illustrated" maybe secured in diilerent Waystothe vessel Which contains th'e Water orfothefniedium to be heatedWitlf thai segmental 'lielical memb rs t ai mb twl i ila er'an h le i be'b Wel in o' bl rins ie pa as each successive section i'sf added tob'i'iild' p lhlL l Ct lT I Ibi iipor n hatfihq j f t 1269f ishta' characthat i w l o a e eiejnt me n .fQ -H d d t flaim e mm h'ei p e w t e vesv rious m rials 7 may be used forf the con'struction of the t r $1 9111as; ill' it n; steel Q' ,c pi'r r Thelatteris a particularly desirablematerial ailse'qf i s h gh a Q n. '19fi gV u- Thoughlhave described withgreat partic ularitythe particular embodiments ofthe' int Qn ere a d;iij lQt t b n r ie t at I ml m i i t ft o a v rio i changes andmo'di'ficationsmay' be made: Without dparti'n'g'froin the invention asdefined in the" appended claims;

Whjat Ilcla'imiis I 7 H w I 1 p 1.- In heater the combination with the Vss lv i vh f t e. flu d; behea e is 01 taine d, of a; sectionalsurrounding the samecomp'ri's'ing aplurali'ty' of separate units pace'df eor l'", the tfitia me ns fer forming a tortuous passage-Waybetween the vessel andthe shell comprising a multiplicity of flataloulate plates spacedapart both longitudinally and ci'rjcumferentiallyand con"- nected by longitudinally extendingplates. H 2.In a heater,means informin a t ortuou's passagbetween in er a nd outer cyl'i-n?drical members comprising'a multiplicity of flat arcuate plates spacedapart both longitudinally and circumferentially and connected by flatlongitudinally extending plates.

3. A heater including a combustion chamber, a shell, positioned abovesaid combustion chamber, a" vessel'vv ithin said s'hell s'aiid shellcomprisinga series of sections arranged one over the other each sectionincluding a plurality of substantially, horizontal areuate plates spacedapart both" longitudinally: and circumferentially and connectedlongitudinally extending members.

4. A heater including a sectional unit having a shell said shellincluding a plurality of arcuate sheet metal plates spaced apart bothlongitudinally circ uniferntially and connected Withone another longitiidinally extending plates to form a} stepped helical structure.

In Witness" whereof, I havei hereunto signa my name. v

' THOMAS E. MURRAY.

